BUTARBUTAR, ELOGIA LIVINGSTONE (2022) STUDI KANDUNGAN KARBON ORGANIK TOTAL PADA SEDIMEN DASAR DI PERAIRAN MUARA SUNGAI LOJI PEKALONGAN, JAWA TENGAH (22o645). Undergraduate thesis, Universitas Diponegoro.

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Abstract

ABSTRAK
Elogia Livingstone Butarbutar. 260 501 171 400 20. Studi Kandungan
Karbon Organik Total Pada Sedimen Dasar Di Muara Sungai Loji,
Pekalongan, Jawa Tengah (Sri Yulina Wulandari dan Aris Ismanto)
Sungai Loji terletak di utara Kota Pekalongan, Jawa Tengah sebagai hilir
dari Sungai Loji dan Sungai Pekalongan. Sungai Loji merupakan sungai yang
terdapat banyak aktivitas manusia seperti aktivitas perikanan, industri serta
pemukiman. Penambahan materi ini akan memicu peningkatan bahan organik
yang dapat memicu terjadinya pencemaran laut. Bahan organik dapat
diidentifikasi dengan penentuan kadar karbon organik. Karbon organik yang
berasal dari perairan sungai dibawa oleh arus menuju muara dan laut lepas.
Ketika energi arus habis lepasan karbon organik yang terbawa dari sungai akan
terjatuh ke dasar perairan dan diikat oleh sedimen dasar. Penelitian ini bertujuan
untuk mengetahui kandungan dan sebaran karbon organik total (KOT) pada
sedimen dasar di muara Sungai Loji, Pekalongan. Pengumpulan data primer pada
penelitian ini pada 24 Agustus 2021 serta data sekunder dikumpulkan dari
Agustus hingga Oktober 2021. Analisis data yang dilakukan berupa analisa
karbon organik total dengan metode Walkley and Black pada sedimen, analisis
Granulometri, analisis Kualitas Perairan dan analisis Arah dan Kecepatan Arus
Laut. Hasil penelitian menunjukkan bahwa sebaran KOT di Muara Sungai Loji
menyebar ke arah laut lepas dengan penurunan konsentrasi, tertingi sebesar
2,01% di badan sungai hingga 0,8% perairan laut lepas. Lepasan karbon organik
di sedimen dipengaruhi kualitas perairan, arus serta pergerakan masa air.
Kecepatan arus di Muara Sungai Loji berkisar antara 0.00-2,51m/s
mempengaruhi transpor sedimen serta tercampurnya massa air dan pengendapan
sedimen. Jenis sedimen mempengaruhi konsentrasi KOT dalam sedimen.
Sedimen pada Muara Sungai Loji beragam dengan dominasi sedimen berjenis
silt/lanau.
Kata Kunci: Karbon Organik Total, Bahan Organik, Sebaran, Metode
Walkley and Black, Muara Sungai Loji.

ABSTRACT
Elogia Livingstone Butarbutar. 260 501 171 400 20. Study of total organic
carbon content in bottom sediments in the waters of the Loji estuary,
Pekalongan, Central Java. (Sri Yulina Wulandari dan Aris Ismanto)
The Loji River is located north of Pekalongan City, Central Java, downstream of
the Loji River and the Pekalongan River. Loji River is a river that has many human
activities such as fishing, industrial and residential activities. The addition of this
material will trigger an increase in organic matter which can trigger marine
pollution. Organic matter can be identified by determining the organic carbon
content. Organic carbon originating from river waters is carried by currents to
estuaries and the open sea. When the current energy runs out, the release of organic
carbon carried from the river will fall to the bottom of the water and be bound by
bottom sediments. This study aims to determine the content and distribution of total
organic carbon (KOT) in bottom sediments at the mouth of the Loji River,
Pekalongan. Primary data collection in this study was on August 24 2021, and
secondary data was collected from August to October 2021. Data analysis was
carried out in the form of analysis of total organic carbon using the Walkley and
Black method on sediments, granulometric analysis, analysis of water quality, and
analysis of the direction and speed of ocean currents. The results showed that the
distribution of KOT in the Muara Sungai Loji spread towards the open sea with a
decrease in concentration, the highest being 2.01% in the river body to 0.8% in the
high seas. The release of organic carbon in sediments is influenced by water
quality, currents, and movement of water masses. The current velocity in the Loji
Estuary ranges from 0.00-2.51m/s affecting sediment transport and mixing of water
masses and sediment deposition. The type of sediment affects the concentration of
KOT in the sediment. The sediments in the Loji Estuary are diverse and dominated
by silt/ type sediments.
Keywords: Total Organic Carbon, Organic Matter, Distribution, Walkley and
Black Method, Loji River Estuary.

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